Radio finder



March l5, 1932. G. cfPAssEK 1,349,379

RADIO FINDER A Filed Marsh 18, 1951 :Sheets-sheet 1 FIG. 1

WI TNESSES I IN VEN TOR:

TORNEYS.

March 15, 1932. G, C, APASSEK 1,849,379

RADIO FINDER I Filed March 18. 1951 3 Sheets-Sheet 2 March 15, 1932. y GC, PASSEK 1,849,379

RADIO FINDER Filed March 1e, 1931 3 sheets-sheet 3 Patented Mar. 1s,1932 vUNITED STATI-:s

GEORGE C. PASSER, 0F PHILADELPHIA, PENNSYLVNIA RADIO FINDER Applicationled March 18, 1931. Serial No. 523,443,

-This invention relates to finders useful in connection with radioreceivers.l

The chief aim of my invention is to dispense with the necessity forcompiling and maintaining a radio log as a source of information inradio reception. This desideratum I .attain as hereinafter fullydisclosed, through provision of va dependable direct reading iinderwhich is simple in construction and easy to operate, and which willvisibly indicate not only the call letters of a broadcasting station fora given tuning dial setting of a radio receiver, but all other importantdata concerning such station, towit: the location of the station on amap, and the wave length aswell as the frequency under which suchstation is authorized to operate.

A further object of my invention is to make provisions in a radio finderhaving the above attributes, whereby adjustments may be effected tocompensate for inaccuracies in the setting of the tuning dial of theparticular rado receiver with which the finder is to be useOther'important advantages inherent to my invention will be manifestfrom the detailed description which follows taken in connection with theattached drawings, wherein Fig. I is a face view of my improved radiofinder. y

Fig. II is a cross sectional view of the same a'kei as indicated by thearrows II-II in Fig. III is a face view of the of my radio finder. Y

Fig. IV is a sectional view of the ground chart taken as indicated bythe arrows IV-IV in Fig. III.

Fig. V is a face view of an adjustable circular scale associated withthe ground chart of the finder; and, p

Fig. VI is an axial sectional view of the scale shown in Fig. V.

ground chart As herein illustrated, the radio finder of my inventioncomprises a circular ground chart 10 bearing two concentric circularscales 11, 12, see Figsl I and III, whereof the outer one is graduatedandi numbered for broadcasting wave lengths in meters, and the inner onegraduated and numbered for broadcasting frequencies in kilocycles. Theinfield 13 of the ground chart 10, see Fig. III, has inscribed thereonat diiferent allocations, the call letters of various broadcastingstations. Associated with the ground chart 10, is a scale ring 14, seeFigs. II, V and VI, which is graduated to correspond with the tuningdial of a radio receiver, and maintained in concentric relation with theground chart 10, inward of the scale 12, by an annular shoulder formedon said chart. The scale ring 14 thus has capacity for circumferentialadjustment in respect to the other scales 11, 12 of the ground chart 10to compensate for inaccuracies in the setting of the broadcast receiverdial. As shown in Figs. III and VI the scale ring 14 is supported bystuds 15 that reach upward through concentric slots 16f= in the groundchart 10, from an underlying disk 17, and axially pivoted to said chartby a tubular rivet 18.

Mounted for concentric rotation about the rivct'18 above the groundchart 10 is a disk 20 which overlies the infield 13 of said groundchart, as well as the scale ring 14. However, at one point in itscircumference, the disk 20 has a notch 21 through which a portion of thescale ring 14 is visible. Within the notch 21, the disk 20 is formedwith a pointer index 22 for coordination with the graduations of thescale ring 14. At a point ninety degrees from the notch 21 around thedisk 20 there is an actuating projection 23 which extends over thescales 11, 12 and which has an opening 24 wherethrough portions of' thesaid scales are exposed. as Well as pointer indices 25 and 26 fol`coordination respectively with the graduation's. of the said scales.`From Fig. I it will be observed .that the various broadcasting stationson the map are marked by apertures 27 cut through the disk 20.

The operation of the device is as follows:

Let it be assumed that the receivingset in connection with which'thedevice is being used. is in operation, and that its dial setting is .93.The disk 20 is accordingly turned about the stud 18 so that its index 22points to the graduation midway between the numerals 92 and 94 on theadjustable ring scale 14 as in Fig. I. With the disk 20 in thispsiti`op,ffheii1dices 25 and 26 show that the wave length and frequencyof the station or statlonbroadcasting at the'time are lrespectively322and 930. Concurrently, the call letters WIBG, WBRC and KFWLare exposedthrough certain of the apertures 27 in the disk 2O to indicate that thebroadcast is being received from one of these stations which, accordingto the map, are located respectively, inthe .States of Pennsylvania,

Alabama and Nevada.

The device 'may also f be used conversely. For example, let it beassumed that the broadcasting wave length, frequency, and dial settingfor the station KWFI is required, then the disk is turneduntil the abovecall letters appear through one of the openings 27 whereupon the indiceswill point to the scales 11, 12 and 14 respectively at the graduationsing a ground chart bearing a lcircular scale scribed thereon at withgraduations corresponding tothe tuning dial of a radioreceiver, andhaving indifferent allocations, the

Y call letters of various broadcasting stations;

and a concentrically mounted disk rotatable v on the chart, having anindex'for4 coordinastations on the ground chartare expose tion with thescale aforesaid, and apertures therethrough, whereby when the disk isindexed ,with-.one` of the graduations of' the scale, the call lettersof the corresponding t0 view through the apertures of the said disk.

2,. A direct reading radio finder comprisnga'ground chart bearin acircular spale withgrad'uations correspon ing to the tuning dial ofaradio-receiver', o thereon at-diierent allocations, the call letters ofvarious broadcasting stations, the said scale beingjcircumferentiallyadjustable on the chartl relative-to the call letter inscriptions toenable compensation for inaccuracies in thesetting of the receiver dialand a concentric'ally v'mounted` disk rotatable onf the chart, havin anindex forcoordination with Athe scale a oresaid,"i and aperturestherethrough whereby when .theI disk is Vindexed with one of thegraduations of the scale, Vthe call letters of the correspondingstations on the ground chart' are indicated throughjahe apertures ofsaid disk'.

3. Avdirect readingradio finder comprising a ground chart bearing ascale with graduations corresponding to the-tuning dial of a radioreceiver, and having inscribed thereon at different allocations, thecall letters ofdifferent broadcasting stations; and amap disk wlthapertures marking various broadcasting and having inscribed f chart.

points as well as an'index for coordination wlth the scale aforesaid,rotatable on the chart, whereby, when the said disk is indexed Awith oneof the scale graduations, the call letters of the correspondingbroadcasting sta- Ytions are indicated through the proper designationapertures of the map.

4. A direct reading radio finder comprising a ground chart bearingthree'econcentric circular scales, one graduated for wave lengths inmeters, another graduated for frequencies in kilocycles and the thirdgraduated to correspond with the tuning dial of a radio receiver, andhaving inscribed at different allocations on its infield, variousstation call letters; and a concentrically mounted disk rotatable on theground chart, having indices for coodination respectively with all threeof the scales aforesaid, as well as apertures, whereby when the disk isindexed with one of the graduations of the dial scale, the call letterson the ground chart ofthe corresponding broadcasting stations areindicated Y through the apertures of the disk and the wave length andfrequency under which such stations operate, concurrently indicated onthe wave length and frequency scales of the ground chart. Y

5. A direct reading radio finder comprising a ground chart bearing threeconcentric circular scales, one aduated for wave [lengths in meters,anot er aduated for frequencies inkilocycles, an the third gradu- 'atedtov correspond with the tuning'dial of aradio receiving set, and-havinginscrlbed onV vits infield, at

station call mounted map disk rotatable on the chart havg indices forcoordination respectively with all three of the scales aforementioned,as well as apertures `marln'ng various broadcastm points, whereby, whenthe disk is indexe with any one of the graduations of the dial scale,the .call letters of the broadcasting stations are indicated through theproper apertures of the map, and the wave length and frequencies underwhich suchfstations operate, concurrently indicated: on the wave Vlengthan different allocations, various 6. A direct reading radio findercompris- -lalg sc es, one graduated for wave lengths in meters theother, graduated for frequencies in kilocycles; a movable scale ringgraduated to correspond with the tuni'nidial of a radio receiver; and aconcentric di rotatable .over -the ground chart having indicesforcoordination respectively with all three ofthe scales, whereby when ofthe graduations of the dial scale, the wave frequency scalesof thevground said disk is indexed With'oneA letters; and a vconcentricallyground chart bearing concentric clrcua length and frequencies of thecorrespondlng broadcasting -of the 'ground chart. Y.

stations are concurrently indicated on the wave lengthand frequencyscales 4 ing a ground chart bearin three concentric 7. A 'direct readingradio finder compriscircular scales, one a uatcd for wave lengths inmeters, anot er graduated for frequencies in kilocycles, and the thirdgraduated to correspond with the tuning dial of a radio receiver, thelast mentioned of the three.

Vwave length and the frequencies of the corresponding broadcastingstations are indicated respectively on the wave length and frequencyscales of the ground chart.v

In testimony whereof I have hereunto signed my name at Philadelphia,Pennsylvania, this 6th day of March, 1931. V

` GEORGE C. PASSEK.

